$6\mathrm{.}10$ Consider a company facing a demand pattern and costs as follows:

Using a "three$-$month" decision rule, the replenishment schedule and associated costs are as follows:

a$.$ Construct a replenishment schedule and calculate the associated costs using the Fixed Economic Order Quantity method.

b$.$ Repeat using the Wagner$-$Whitin Algorithm.

c$.$ Repeat using the Silver$-$Meal Heuristic.

d$.$ Repeat using the Least Unit Cost method.

e$.$ Repeat using the Part$-$Period Balancing method. f$.$ Repeat using the Periodic Order Quantity method.